component

L78L12ACUTR

Public Made by Adom

by adom

STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
Name Last commit message Last updated
docs l78l12acutr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
l78l12acutr-etched.fit.json l78l12acutr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
l78l12acutr-etched.glb l78l12acutr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
l78l12acutr-etched.step l78l12acutr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
l78l12acutr.glb Publish 0.1.0 · Ray
l78l12acutr.kicad_mod Publish 0.1.0 · Ray
l78l12acutr.kicad_sym Publish 0.1.0 · Ray
l78l12acutr.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
l78l12acutr.step Publish 0.1.0 · Ray
package.json Publish 0.2.0 · Ray
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
page.json l78l12acutr: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray
README.md l78l12acutr: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

L78L12ACUTR

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

L78L12ACUTR from STMicroelectronics, in a SOT-89-3. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VOUT power_out Regulated +12 V output pin. Delivers up to 100 mA into the load with typical output voltage 12 V (min 11.04 V / max 12.96 V for the AC grade at TJ=25 C). A 0.1 uF ceramic capacitor to GND is recommended for stability.
2 GND power_in Common/ground reference pin. On the SOT-89 the GND pin is thermally and electrically tied to the large tab/heat spreader on the back side of the package; connect to a copper ground pour for heat dissipation.
3 VIN power_in Unregulated positive input voltage. For the 12 V version, typical operating VI range is roughly 14.5 V to 30 V (absolute maximum 35 V for the 12 V option). Bypass with a 0.33 uF capacitor close to the pin.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOT-89-3
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • L78L12ACUTR
  • L78L12ACUTRAZ
  • L78L12ACUTRACZ
  • L78L12ACUTRABD
  • L78L12ACUTRACD
  • L78L12ACUTRD

CAD (KiCad official)

  • Symbol: L78L12ACUTR
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: l78l12acutr-etched.step / l78l12acutr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); l78l12acutr.step / l78l12acutr.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
l78l12acutr.step 57 KB You want the bare part, or you mark your own boards.
l78l12acutr-etched.step 1.4 MB You want the part with L78L12ACUTR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 370 faces against 42 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (45 pp, sha256 43922ae159face7e, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF